تحلیل عددی و تجربی شکل‌دهی افزایشی دونقطه‌ای قطعات با هندسه پیچیده

نوع مقاله: مقاله پژوهشی

نویسندگان

1 عضو هیات علمی / دانشکده مهندسی مکانیک، دانشگاه بیرجند

2 دانشجوی دکتری / دانشکده مهندسی مکانیک، دانشگاه بیرجند

چکیده

در این پژوهش به‌کمک شبیه­سازی و مقایسه نتایج آن با مشاهدات آزمایشگاهی به بررسی عددی و تجربی فرآیند شکل‌دهی افزایشی دونقطه­ای بر روی قطعات با فُرم آزاد پرداخته شده است. بر اساس بررسی­های انجام شده، شبیه­سازی شکل‌دهی افزایشی دونقطه­ای در معدود تحقیقاتی برای قطعات با فرم­های مشخص نظیر نیم­کره و هرم منتظم ناقص که مسیر ابزار به سادگی با توابع ریاضی قابل تعریف است، انجام شده است. این در حالی است که روش اتخاذ شده برای شبیه­سازی شکل‌دهی افزایشی دونقطه­ای در این مقاله محدود به فرم خاصی نیست. در این مقاله شبیه­سازی عددی برای لوله اگزوز یک نوع هلیکوپتر انجام شده و سپس با کمک آزمایش­های تجربی صحت نتایج شبیه­سازی تایید شده است. با مقایسه نمودار حد شکل‌دهی ورق مورد نظر و نمودارهای کرنش­های اصلی و فرعی بدست آمده از شبیه­سازی در حین فرآیند می­توان از سلامت ورق و به طور کلی امکان انجام شکل‌دهی افزایشی دو نقطه­ای بر روی قطعه مورد نظر اطمینان حاصل کرد.

کلیدواژه‌ها


عنوان مقاله [English]

Analyses of two-point incremental forming for parts with complex geometries

نویسندگان [English]

  • Khalil Khalili 1
  • Mojtaba Esmailian 2
1 Department of Mechanical Engineering, University of Birjand, Birjand
2 Department of Mechanical Engineering, University of Birjand, Birjand
چکیده [English]

In this study, numerical and experimental investigation of two-point incremental forming of free-form workpieces is conducted. According to researches done, only a few number of previous works regarding numerical simulation of incremental forming method are concentrated on two-point type of this technique. However, all of these works have considered simple geometries like: truncated cone, truncated hemisphere and truncated regular pyramid. In contrast, in this paper, the numerical simulation is carried out for free-form parts and the methodology is independent of the geometry of the bottom punch. Thus the methodology can be employed to examine the feasibility of two-point incremental forming for any given geometry. In this paper a numerical simulation for exhaust tube a type of helicopter has been done and the results of simulation are verified with experimental data. Comparing major and minor strain values at the end of simulation with the forming limit diagrams of sheet metals it was possible to examine the likely tearing in the sheet.

کلیدواژه‌ها [English]

  • Two-point incremental forming
  • finite element method
  • Free-form
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